Labels added to namespace object while KF profile creation persistent even after deleting profile

[PoornimaDevii]

/kind bug

What steps did you take and what happened:
[A clear and concise description of what the bug is.]
In a KF installed environment, it is specifically required that namespace is created initially, post which KF profile is created. Required namespace-labels such as pipelines.kubeflow.org/enabled: "true", serving.kubeflow.org/inferenceservice: enabled, etc are added to the corresponding namespace object, on creating the profile. But on deletion of the profile, the profile controller fails to erase/remove those labels from the namespace object.

P.S. It is known that the KF profile is the parent object which spins out a namespace usually, but in my case, its necessary to do first create a namespace and then later profile.

What did you expect to happen:
The labels which were added to namespace object on profile creation, needs to be reversed/removed on profile deletion.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Kubeflow version: (version number can be found at the bottom left corner of the Kubeflow dashboard): v1.4
• Kustomize version : 3.4.0
• Kubernetes platform: (e.g. minikube) EKS
• Kubernetes version: (use kubectl version): 1.19
• OS (e.g. from /etc/os-release): Ubuntu 18.04.3 LTS

[PoornimaDevii]

@andreyvelich

[biswajit-9776]

/transfer manifests